Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc95d96930d23e2c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 15:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4869740ab0ce68a8a6e45a610b60be82 SHA-1: c879d247fac63dbb9df73682d3f10560829d1ec9 SHA-256: bc95d96930d23e2c5d608262e81e13352270372a3853a21eadc1b8ce001c3ad9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a distribution or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the PDF structure implies it's designed to redirect users to malicious sites or download further payloads, aligning with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ceqm0ilo5i4okplpjpcqobgdfa/gofedit.pdf In PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823f0fdd480---renufubabuxezedokofudut.pdfIn PDF document text
    • http://splogservice.ru/content/files/56009376204.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/81487646211.pdfIn PDF document text
    • https://virker-ikke.dk/files/40097651301.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/87726252561.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/dizafetulubapanobesoredig.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f33a9a0a9eb---vukafelamesubafejolas.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/km5bu9sm2563h8o957h08ao1p2/guzirikugotevuv.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/movubuxebemu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead6a31649---mupax.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/99473581930.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/8670302090.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/ripupuxelatof.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/60148149399.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/xelasezapu.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/bigudewudepatutap.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/gutivuripekesuz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/764e51f4c0a50942679f4a1da6d4e8d5/76451083339.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/kawukolofiguponenelobip.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/66158762888.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/55622189315.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=egypt+concession+map+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10912 bytes
SHA-256: 32ca665bb76113223a9d94d17feb03bbd86e0fce82f82b62d19735345cd8bbf4
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 17416 bytes
SHA-256: 05f7bf90d34fbcbe7e6745ccc491747b953a94ededa447f36ebdd297b84de4e9